Alienware has just refreshed its 15 and 17-inch models with a slimmer and lighter design. The new notebooks are also equipped with new GPU options from NVIDIA and AMD. Here's what you need to know about Alienware’s new gaming notebooks.

Thanks to advances in CPU and GPU technology, gaming notebooks have never been more powerful. We pit the best of the best from Aftershock, ASUS, Dell, MSI, Razer and Toshiba against each other in a battle to the death to find out which is best.